Merged requested to merge update-py-installexternal into master
What this MR does / why does DuMux need it:
Updates installexternal.py to use latest dune, opm and Mmesh
Notes for the reviewer
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does the new code follow the style guide?
do the test pipelines pass? (see guide on how to run pipelines for a merge request)
is the code you changed and/or the new code you wrote covered in the test suite? (if not, extend the existing tests or write new ones)
does your change affect public interfaces or behavior, or, does it introduce a new feature? If so, document the change in
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\ncharacter. Make sure there is no
\ No newline at end of filecomment in "Changes" of this MR.